Mind of tempest
(he/him)advocate for 5e psionics
they are related to midgard and its other places but they are fairly universalisable.That’s a fairly common misconception, but it’s actually not true. Kobold Press produces a number of non-Midgard products aimed at ALL D&D players each year.
Products like Deep Magic, Tome of Heroes, Vault of Magic, all of the Tome of Beasts books, etc are ALL ‘generic’ 5E D&D releases that are not related to Midgard at all.